I had the same question this morning after I took Readi-Cat 2 for an abdominal CT. I called the number on the bottle and they said the ingredients for this one; Cat# 723 (non flavored) are:
citric acid, natural gum, natural flavors, potassium, purified water, saccharine, sorbitol, sodium benzoate, simethicone emultion. rep said there is no gluten so...